Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c820988ce89cedf…

MALICIOUS

PDF

43.9 KB Created: 2020-11-07 01:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 70856bfb200df17b56a30e5c5d933aab SHA-1: db5eda2897d8b4c081d32a6f3b6fcd9fe92b19d4 SHA-256: 0c820988ce89cedf74f507df9b4c1cd02b2e3e9320f490171a5df42403ff6d39
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/aws?keyword=aws+cloudformation+load+balancer+listener PDF link annotation
    • https://xabizukilitexe.weebly.com/uploads/1/3/4/3/134335342/sovedonewidixadusek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_5fa5db6261164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_5f9f2646efd56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5f92d6800f3de.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/2989992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f909990bb37a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_5f987dd445f46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/20563247891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1a2618-d58f-4716-982c-35da1517c250/glamour_photography_poses.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/67350162775.pdfIn PDF document text
    • https://firomikodow.files.wordpress.com/2020/11/4323902123.pdfIn PDF document text
    • https://wulitop.files.wordpress.com/2020/11/rozagudapunijajibo.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/higher_education_everfi_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/16399860426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc40ca32-5b5d-4c28-80d0-2ddc84509912/pizozovizolidi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C00 5388 bytes
SHA-256: f31f308c3917d1bc5820a4a951857e7df3c82a04538d8b1ccc64566f885213d9
font_01_sfnt_off00007e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4A 10568 bytes
SHA-256: e5e1eef456480c4350643739aac4fe75a2d8af12051fef5d1452bd733dbe8ef3